Selma's "Bloody Sunday" remembered

      |In March of 1965, CBS News cameras rode along with school children in Alabama at a legendary time in the civil rights movement. This weekend, people gathered on Selma's Edmund Pettus Bridge to mark the anniversary of a brutal showdown between protesters and police. Senior White House correspondent Bill Plante, who covered the civil rights movement, reports from Selma, then joins the "CBS This Morning" co-hosts in the studio.